sniping

1. To hunt snipe.
2. To shoot at individuals from a concealed place.
3. (by extension) To shoot with a sniper rifle.
4. To watch a timed online auction and place a winning bid against (the current high bidder) at the last possible moment.
5. To nose (a log) to make it drag or slip easily in skidding.
6. (ice hockey slang) To score a goal.
7. To move the ball quickly in a different direction.

1. To make malicious, underhand remarks or attacks.
2. To attach a note or sticker to (an existing poster) to provide further information, political criticism, etc.

noun

A shooting from a concealed place.